[INFO] crate promises 0.2.0 is already in cache
[INFO] extracting crate promises 0.2.0 into work/ex/beta-1.37-6/sources/1.36.0/reg/promises/0.2.0
[INFO] extracting crate promises 0.2.0 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/promises/0.2.0
[INFO] validating manifest of promises-0.2.0 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of promises-0.2.0 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing promises-0.2.0
[INFO] finished frobbing promises-0.2.0
[INFO] frobbed toml for promises-0.2.0 written to work/ex/beta-1.37-6/sources/1.36.0/reg/promises/0.2.0/Cargo.toml
[INFO] started frobbing promises-0.2.0
[INFO] finished frobbing promises-0.2.0
[INFO] frobbed toml for promises-0.2.0 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/promises/0.2.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing promises-0.2.0 against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/promises/0.2.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 4c391fd162519560054971307decd5bb05619c019b2398dee2bb2cee8100f5ef
[INFO] running `"docker" "start" "-a" "4c391fd162519560054971307decd5bb05619c019b2398dee2bb2cee8100f5ef"`
[INFO] [stderr]    Compiling promises v0.2.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.16s
[INFO] running `"docker" "inspect" "4c391fd162519560054971307decd5bb05619c019b2398dee2bb2cee8100f5ef"`
[INFO] running `"docker" "rm" "-f" "4c391fd162519560054971307decd5bb05619c019b2398dee2bb2cee8100f5ef"`
[INFO] [stdout] 4c391fd162519560054971307decd5bb05619c019b2398dee2bb2cee8100f5ef
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/promises/0.2.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] 6dc2bf29a40c491c4476cfe2668de48b14c3fec37243f7a0cb34147145f3ce46
[INFO] running `"docker" "start" "-a" "6dc2bf29a40c491c4476cfe2668de48b14c3fec37243f7a0cb34147145f3ce46"`
[INFO] [stderr]    Compiling promises v0.2.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::fs`
[INFO] [stderr]  --> src/tests.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::fs;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `file`
[INFO] [stderr]   --> src/tests.rs:23:12
[INFO] [stderr]    |
[INFO] [stderr] 23 |         Ok(file) => println!("Created a file!"),
[INFO] [stderr]    |            ^^^^ help: consider prefixing with an underscore: `_file`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `p`
[INFO] [stderr]   --> src/tests.rs:31:9
[INFO] [stderr]    |
[INFO] [stderr] 31 |     let p: Promise<(), ()> = Promise::new(|| {
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_p`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `create_file`
[INFO] [stderr]   --> src/tests.rs:13:1
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn create_file() -> Result<File, io::Error> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.04s
[INFO] running `"docker" "inspect" "6dc2bf29a40c491c4476cfe2668de48b14c3fec37243f7a0cb34147145f3ce46"`
[INFO] running `"docker" "rm" "-f" "6dc2bf29a40c491c4476cfe2668de48b14c3fec37243f7a0cb34147145f3ce46"`
[INFO] [stdout] 6dc2bf29a40c491c4476cfe2668de48b14c3fec37243f7a0cb34147145f3ce46
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/promises/0.2.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-07-23" "test" "--frozen"`
[INFO] [stdout] a19bfc639678f23d957b5d6992d7717c8015e44d324ad11b45b1d4b9da91406d
[INFO] running `"docker" "start" "-a" "a19bfc639678f23d957b5d6992d7717c8015e44d324ad11b45b1d4b9da91406d"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/promises-d7c66642da639852
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] Handling result
[INFO] [stdout] Created a file!
[INFO] [stdout] test tests::test_new ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests promises
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "a19bfc639678f23d957b5d6992d7717c8015e44d324ad11b45b1d4b9da91406d"`
[INFO] running `"docker" "rm" "-f" "a19bfc639678f23d957b5d6992d7717c8015e44d324ad11b45b1d4b9da91406d"`
[INFO] [stdout] a19bfc639678f23d957b5d6992d7717c8015e44d324ad11b45b1d4b9da91406d